The only backlink checker worth looking at is ahrefs, and even that's not perfect. As long as your backlinks are on websites with fairly low OBL (outbound links), and you build a tier 2, the links will count. Don't worry about backlinks checkers - as long as google crawls the link, it counts.

This is because most of these people spamming bookmark links are doing so on the same domains and less unique domains. This is what I learned from my research, filtered the list with scrapebox and was shocked.

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